deps: update dependency com.google.cloud:google-cloud-monitoring-dashboard-bom to v1.2.0 (#1832)
deps: update dependency com.google.cloud:google-cloud-monitoring-dashboard-bom to v1.2.0 (#1832)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-monitoring-dashboard-bom](https://togithub.com/googleapis/java-monitoring-dashboards) | `1.1.0` -> `1.2.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-monitoring-dashboard-bom/1.2.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-monitoring-dashboard-bom/1.2.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-monitoring-dashboard-bom/1.2.0/compatibility-slim/1.1.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-monitoring-dashboard-bom/1.2.0/confidence-slim/1.1.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/java-monitoring-dashboards</summary>

### [`v1.2.0`](https://togithub.com/googleapis/java-monitoring-dashboards/blob/master/CHANGELOG.md#&#8203;120-httpswwwgithubcomgoogleapisjava-monitoring-dashboardscomparev110v120-2021-04-12)

[Compare Source](https://togithub.com/googleapis/java-monitoring-dashboards/compare/v1.1.0...v1.2.0)

##### Features

-   added mosaic layout ([#&#8203;332](https://www.github.com/googleapis/java-monitoring-dashboards/issues/332)) ([01166ea](https://www.github.com/googleapis/java-monitoring-dashboards/commit/01166ea60c7b124a9f41bc7b16eb1eeb7cda67ea))

##### Documentation

-   clarified alignment_period max value and updated IAM docs link ([01166ea](https://www.github.com/googleapis/java-monitoring-dashboards/commit/01166ea60c7b124a9f41bc7b16eb1eeb7cda67ea))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.21.0 ([#&#8203;341](https://www.github.com/googleapis/java-monitoring-dashboards/issues/341)) ([c342cae](https://www.github.com/googleapis/java-monitoring-dashboards/commit/c342cae9cec4e84c09ab1b9e62dad2b24b89261f))

</details>

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### Configuration

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